Not too long ago, I had a door that is always shut, seemingly open on it's own. I never observed it actually open but it was always closed and something was opening it when people were not around. I was open minded about the possibility of it being a paranormal experience but decided to first try to pursue logical explanation. In the end I debunked this seemingly paranormal experience. There was nothing paranormal about it. It had a perfectly natural explanation.
I guess humans can sometimes be too quick to attribute perfectly natural occurrences to the supernatural.
I would imagine there are unexplained phenomenon in the world but I've never experienced anything that I could attribute to the supernatural.
I still however find the topic and possibility fascinating.